Chemical Engineering MCQs

Page No. 621

For transporting pasty material, one will use a/an__________________?


aApron conveyor


bBelt conveyor


cScrew conveyor


dBucket elevator


View Answer Screw conveyor

Dispersion of a gas through liquid is done by using a__________________?


aSparger


bKneader


cMasticator


dNone of these


View Answer Sparger

The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be_________________?


a0.5 Wi


bWi


c1.34 Wi


d3.34 Wi


View Answer 1.34 Wi

Which of the following oxides is not present in hematite iron ore ?


aTitanium oxide


bCalcium oxide


cCobalt oxide


dManganese oxide


View Answer Cobalt oxide

In filtration, the use of ‘filter aid’ helps in__________________?


aReducing the filtration pressure


bAccelerating the rate of filtration


cDeplugging the filter medium


dEnhancing the cake porosity in case of a dense impermeable cake



Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator ?


aCresylic acid


bCopper sulphate


cCalcium carbonate


dSodium carbonate


View Answer Copper sulphate

The filtrate flow rate in constant pressure filtration___________________?


aContinuously increases


bContinuously decreases


cRemain constant throughout


dMay increase or decrease; depends on the pressure



In case of a ball mill ?


aCoarse feed requires a larger ball


bFine feed requires a larger ball


cOperating speed should be more than the critical speed


dNone of these



Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the___________________?


aCoagulation


bFlocculation


cSedimentation


dClarification


View Answer Sedimentation

Gyratory crushers compared to the reciprocating jaw crushers__________________?


aHave greater capacity per unit of discharge area


bCrush intermittently


cAre less suitable for coarse materials


dHave less steady power consumption



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